Installation guide

APPENDIX

Cisco 4000-M ROM Monitor E-1

Cisco 4000-M ROM Monitor

This appendix describes the Cisco 4000-M ROM monitor, which is also known as the

bootstrap program. The ROM monitor can help you isolate or rule out hardware problems

encountered when installing your router. A summary of the ROM monitor diagnostic tests

and command options is provided.

Entering the Cisco 4000-M ROM Monitor Program

The ROM monitor diagnostics help initialize the processor hardware and boot the main

operating system software. If you set the software conﬁguration register (bits 3, 2, 1, and

0) to zero, you can start the server in the standalone ROM monitor. The ROM monitor

prompt is an angle bracket (>).

Enter the following command at the ROM monitor prompt (>) to enable the Break key and

to default to booting in the ROM monitor:

o/r 0x0

See Table E-1 for an explanation of the o/r command.

While running the system software, you can reset the conﬁguration register to 0x0 by

entering conﬁguration mode, and then entering the following conﬁguration command:

config-register 0x0

The new conﬁguration register value, 0x0, takes effect after the router is rebooted. If you

set the conﬁguration to 0x0, you must manually boot the system each time you reboot the

router.